Transfers and Servicing of Mortgage Loans (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Activity in capitalized MSRs
Balance, beginning of period	$ 1,279	$ 1,022	$ 1,022
Additions	25	74
Sales	(1)
Changes in fair value due to:
Realization of expected cash flows	(34)	(77)
Changes in market inputs or assumptions used in the valuation model	(45)	82
Balance, end of period	1,224	1,101	1,279
Contractually specified servicing fees, late fees and other ancillary servicing revenue were recorded within Loan servicing income as follows:
Servicing fees from capitalized portfolio	92	100
Late fees	5	5
Other ancillary servicing revenue	8	10
Weighted average life of MSRs	6 years 2 months 12 days		6 years 6 months
Cash flows relating to loan sales in which the Company has continuing involvement
Proceeds from new loan sales or securitizations	2,336	7,171
Servicing fees from capitalized portfolio	92	100
Purchases of delinquent or foreclosed loans	(17)	(20)
Servicing advances	(522)	(285)
Repayment of servicing advances	523	290
Realized Gain Loss on Sale
Pre-tax gains related to sale or securitization of residential mortgage loans	72	242
Mortgage servicing advances
Advance receivables
Outstanding servicing advance receivables	$ 568		$ 565

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All amounts that are due to the servicer of a financial asset, excluding contractually specified servicing fees and late fees.

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Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

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Cash Flows between a transferor and a transferee attributable to purchases of previously transferred financial assets (or its underlying collateral) related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

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All amounts that are due to the servicer of a financial asset as a result of the debt holder not meeting the monthly payment terms.

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Reflects, by transferred financial asset type, the amount of sales proceeds in excess of or deficient from the sum of the carrying amounts of transferred financial assets plus transaction costs, including those transactions in which the seller/transferor has continuing involvement with the financial assets that have been transferred.

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Amount conveyed to unrelated parties of contract to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Weighted average life of financial assets and financial liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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